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MCQs

Total Questions : 99 | Page 9 of 10 pages
Question 81. . Pluronic F68 is added to cell culture media as
  1.    a nutrient
  2.    a shear protectorant
  3.    to increase oxygen transfer rates
  4.    all of these
 Discuss Question
Answer: Option B. -> a shear protectorant
Question 82. . The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
  1.    increases with stirring speed but decreases with mixing time
  2.    increases with stirring speed and increases with mixing time
  3.    decreases with stirring speed but increases with mixing time
  4.    decreases with stirring speed and decreases with mixing time
 Discuss Question
Answer: Option D. -> decreases with stirring speed and decreases with mixing time
Question 83. . If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
  1.    newtonian
  2.    rheopectic
  3.    viscoelastic
  4.    thixotropic
 Discuss Question
Answer: Option D. -> thixotropic
Question 84. . 
A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
  1.    2500
  2.    100
  3.    12,50,000
  4.    1,000,000
 Discuss Question
Answer: Option C. -> 12,50,000
Question 85. . Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
  1.    The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
  2.    When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
  3.    At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 86. . A thixotropic fluid is one in which the viscosity
  1.    is constant regardless of the stirrer speed or mixing time
  2.    changes during mixing but returns to its original state after mixing
  3.    increases with mixing time
  4.    decreases with mixing time
 Discuss Question
Answer: Option D. -> decreases with mixing time
Question 87. . Newtonian fluid is one in which the viscosity
  1.    remains constant with time and power input
  2.    increases with the level of power input
  3.    decreases with the level of power input
  4.    drastically increases with the level of power input
 Discuss Question
Answer: Option A. -> remains constant with time and power input
Question 88. . Reynolds number for laminar flow over a plate should be less than
  1.    500 mm
  2.    5 x 10-5
  3.    5 x 10-5
  4.    5 m
 Discuss Question
Answer: Option C. -> 5 x 10-5
Question 89. . The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
  1.    the concentration of lactate in the medium
  2.    the level of lactate oxidase activity in the medium
  3.    the level of lactate dehydrogenase activity
  4.    the level of lactase activity in the medium
 Discuss Question
Answer: Option C. -> the level of lactate dehydrogenase activity
Question 90. . A Brookfield viscometer cannot determine the shear stress because
  1.    A. the shear stress is not defined
  2.    a computer is required
  3.    the impeller type is given only by numbers
  4.    all of the above
 Discuss Question
Answer: Option A. -> A. the shear stress is not defined

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